I do spend quite a bit of time here on Meta, so I think it’s fair to say, that I like it here 
But apart from that - and I think I mentioned it elsewhere already - I like the StayForever community (StayForever is a German podcast about retro games). First, it has this nicely customised category view with great pixel art. And second, the atmosphere there is usually quite relaxed, and people are also welcoming towards newcomers.